In a medical apparatus including a medical imaging system and a medicalposition and navigation system (MPS), the medical imaging system including animaging transmitter, periodically emitting imaging radiation and an imagingdetector, the medical position and navigation system including at least oneMPS transmitter periodically transmitting MPS radiation and at least one MPSdetector, the MPS radiation electromagnetically interfering with at least onemode of operation of the imaging detector, a device for eliminatinginterference to the imaging detector caused by positioning radiation, thedevice comprising a synchronizer, coupled with the medical imaging system andwith the medical position and navigation system, synchronizing the imagingdetector and each the at least one MPS transmitter, so that neither of the atleast one MPS transmitter transmits during the at least one mode of operationof the imaging detector.
